/* Copyright 2010 Michael Bedward, and others
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 *  Copyright (c) 2010, Michael Bedward. All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without modification,
 *  are permitted provided that the following conditions are met:
 *
 *  - Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 *  - Redistributions in binary form must reproduce the above copyright notice, this
 *    list of conditions and the following disclaimer in the documentation and/or
 *    other materials provided with the distribution.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 *  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 *  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 *  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 *  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 *  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.eclipse.imagen.media.contour;

import java.awt.RenderingHints;
import java.awt.image.RenderedImage;
import java.awt.image.renderable.ParameterBlock;
import java.awt.image.renderable.RenderedImageFactory;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import org.eclipse.imagen.ROI;

/**
 * The image factory for the Contour operator.
 *
 * @author Michael Bedward
 * @since 1.1
 * @version $Id$
 */
public class ContourRIF implements RenderedImageFactory {

    /**
     * Creates a new instance of ContourOpImage in the rendered layer.
     *
     * @param paramBlock specifies the source image and the parameters "roi", "band", "outsideValues" and "insideEdges"
     * @param renderHints rendering hints (ignored)
     */
    public RenderedImage create(ParameterBlock paramBlock, RenderingHints renderHints) {

        Object obj = null;

        ROI roi = (ROI) paramBlock.getObjectParameter(ContourDescriptor.ROI_ARG);
        int band = paramBlock.getIntParameter(ContourDescriptor.BAND_ARG);

        List<Double> contourLevels = null;
        Double interval = null;

        Collection levels = (Collection) paramBlock.getObjectParameter(ContourDescriptor.LEVELS_ARG);
        if (levels != null && !levels.isEmpty()) {
            contourLevels = new ArrayList<Double>();
            for (Object val : levels) {
                contourLevels.add(((Number) val).doubleValue());
            }
        } else {
            // No contour levels - use interval parameter
            obj = paramBlock.getObjectParameter(ContourDescriptor.INTERVAL_ARG);
            interval = ((Number) obj).doubleValue();
        }

        Collection noDataValues = (Collection) paramBlock.getObjectParameter(ContourDescriptor.NO_DATA_ARG);
        Boolean strictNodata = (Boolean) paramBlock.getObjectParameter(ContourDescriptor.STRICT_NO_DATA_ARG);
        Boolean simplify = (Boolean) paramBlock.getObjectParameter(ContourDescriptor.SIMPLIFY_ARG);
        Boolean smooth = (Boolean) paramBlock.getObjectParameter(ContourDescriptor.SMOOTH_ARG);

        return new ContourOpImage(
                paramBlock.getRenderedSource(0),
                roi,
                band,
                contourLevels,
                interval,
                noDataValues,
                strictNodata,
                simplify,
                smooth);
    }
}
